IS:09921 (PART 4) - 1985; Specification for alternating current disconnectors(Isolators)and earthing switches for voltages above 1 ooo V Part 4; type tests and routine tests

IS:09921 (PART 4) - 1985; Specification for alternating current disconnectors(Isolators)and earthing switches for voltages above 1 ooo V Part 4; type tests and routine tests - New Delhi BIS 1985 - 39p

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